shithub: pokecrystal

ref: add58fb00d73495655243c4cf13b730bbc1b3242
dir: /home/region.asm/

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IsInJohto::
; Return 0 if the player is in Johto, and 1 in Kanto.

	ld a, [wMapGroup]
	ld b, a
	ld a, [wMapNumber]
	ld c, a
	call GetWorldMapLocation

	cp FAST_SHIP
	jr z, .Johto

	cp SPECIAL_MAP
	jr nz, .CheckRegion

	ld a, [wBackupMapGroup]
	ld b, a
	ld a, [wBackupMapNumber]
	ld c, a
	call GetWorldMapLocation

.CheckRegion:
	cp KANTO_LANDMARK
	jr nc, .Kanto

.Johto:
	xor a
	ret

.Kanto:
	ld a, 1
	ret